Pencil-sharpening machine.



L. MYERS.

Patented Feb. 1, 1916.

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PENCIL SHARPENING MACHINE.

APPLICATION FILED DEC. 22, 1913'.

Patented Feb. 1, 1916.

2 SHEETS-SHEET 2 wm. e.

' LOUIS'MYERS," OF BROOKLYN, NEW YORK, ASSIGNOR TO THE TRAUT & HINEMANU- FACTURING COMPANY, F NEW BRITAIN, CONNECTICUT, A CORPORATIQN 0FCONNECTICUT.

Specification of Letters Patent.

PENCIL-SHARPENING MACHINE.

Patented Feb. 1, 1916.

To all whom t may concern:

Be it known that I, Louis MYERS, a citizen of the United States,residing at Brooklyn, Kings county, New York, have invented certain newand useful Improvements in Pencil-Sharpening Machines, of which thefollowing is a full, clear, and exact description.

This invention relates to machines for sharpening pencils, and has forits obj ect improvements in the construction of the same for cutting animproved point upon a pencil, and for the promotion of genera]efiiciency in operation.

With this object in view 1 have devised a machine, several practicalembodiments of which are disclosed in the accompanying drawings, inwhich- Figure 1 is a vertical section of the entire machine takenthrough line 1 1 of Fig. 2;

.-Fig. 2 is a plan of the machine; Fig. 3 is a horizontal cross-sectionof the machine through line 8 3 ofFig. 1; Fig. 4: is a horizontalcross-section of the pencil-holding means through line 4 4 of Fig. 1;Fig. 5 is a vertical section of the supporting stand ard of the machinethrough line 5 5 of Fig.

'2; Fig. 6 is a transverse section of the pencil-holding and guidingmeans through line 6 6 of Fig. 4; Fig. 7 is a horizontal section of thecutters through line 10 1O of Fig. 1.

Referring more particularly to the drawings, the main frame consists ofa vertical hollow standard 1, base 2, and upper table 18. Projectinglaterally from the frame 1s an arm 8, which, together with the uppertable 1.8, forms bearings for a revolving milling device hereinaftermore particularly described. v

The pencil indicated at P is guided and preferably held by clampingmeans firmly against rotation'. Slidably mounted in the hollow standard1 of the frame is a post 22 (see Fig. 5) supporting at its upper end ahorizontal plate 21. This plate has acentral orifice through which thepencil is adapted to extend, and at each side of this orifice is mounteda sliding clamping jaw 31 for gripping the pencil. (SeeFig. 1). Thesejaws are moved for gripping and releasing the pencil by means of a pinand slot connection with a slidable operating member 27. 1t will benoted that the slots 29 in the operating member 27 are diagonallyarranged with respect to the clamping jaws 31 so as to act as a cam uponthe pins 80 of said jaws, when the member 27 is moved back and forth.The operating member 27 is provided with a thumb-piece 28 projectinglaterally through the side of the plate 21 to be engaged by the lingerof the operator. A spring 32 (see Fig. 1) is connected with the plate 27to normally hold it in position for closing the clamping jaws 31.

Referring more particularly to Figs. 4 and 5, it will be seen that therear end of the operating member 27 is provided with a slotted orificewith beveled walls 27. EX- tending through this orifice is rod 24:having an upper beveled head 25 for coperative engagement with thebeveled walls 275. The rod 24 extends out through the end of post 22 andis provided with a cap nut 26 thereon located within the chamber of thehollow standard 1. The post 22 is provided at one side with a toothedrack 23 (Fig. 1) which is adapted to engage a pinion 19, loosely mountedon the main operating shaft 6 of the machine. The operating shaft 6 asshown has fixed thereto at one end the usual handle 7, and at the otherend a bevel gear 5.' A spring-pressed pawl 20 is carried on the bevelgear 5 for engaging the teeth of pinion 19. When the shaft 6 is rotatedin its right-hand direction, the pawl 20 rides idly ovei` the pinion 19without operating the same, but when the handle 7 is reversed pinion 19is carried therewith and by its engagement with rack 23 elevates theplate 21. When plate 21 has beenelevated far enough to bring nut 26against shoulder of standard 1 (see Fig. 5), the further elevation ofplate 21 causes a coaction between the beveled head 25 and beveled walls27, so that plate 27 yis moved against its spring to open the jaws 31. Apencil may then be inserted through the opening of the plate andextended through a central opening 18 of table 18 into the millingdevice as shown in Fig. 1. As soon as handle 7 is slightly released, thejaws 31 `will spring back in position and clamp the pencil tightly.Thepencil is now ready to be sharpened by the operation of the millingdevice, which will now be described.

Referring first to Fig. 1, the carrier 3' is revolubly mounted betweentable 18 and arm 8 with its upper hollow hub 9 `in a vided with a bevelgear L meshing with the operating bevel gear 5. Mounted on the carrierfor independent rotation thereon are one or more milling cutters 11 withtheir axes disposed atan Vangle to the axis of rotation of the carrier 3and of the pencil axis I. These milling cutters have bevel gears 1Gmeshing with a circular rack 17 fixed upon the upper-table 18, wherebywhen the milling cutters are carried about the pencil by the revolvingmovement of carrier 3, they 'are given independent rotation by theengagement of their bevel gears 16 with the stationary rack 17. It willbe noted that the pencil is held within the hollow hub 9 of the carrier3 so that its longitudinal axis is Asubstantially coincident with theaxis of said revolving carrier. The milling cutters 11 in the presentmodification are partly cylindrical and partly tapered like the frustumof a cone and have peripheral cutting teeth spirallyl arranged thereonfor acting upon the pencil. Each milling cutter has its milling surfacearranged at one portion at a different angle relative to its axis thanat another portion. whereby two different angles of cut will be obtained`upon the pencil. F or instance in Fig. 1 the milling surface of cutterl1 is substantially parallel to its axis to the point 1-2, but the lowerportion 13 of the milling surface is inclined or tapered. It will beobserved that by this construction the pencil is cut toward the point Cwith a smaller angle relative to the pencil axis than at the body of thepencil C. The advantage of this construction is that the pencil is cutwith much more of the lead exposed for giving a longer point. Also by,reason of the closer proximity and slightly slower movement of themilling cutting teeth on the lead of the pencil than on the body of thepencil, the lead'is less Vliable to be broken than formerly.

Inl order. to provide an -adjustable stop which shall engage the pencilpoint and limit its longitudinal movement toward the remote end of thecarrier and the cutting devices at various positions according to thenature of the point desired. I provide a sliding pin 5l passing throughthe lower bearing 10 and the lower end of the carrier so 'thatits'upperend lies in the path of the pencil point. To the lower end of thepin Iafiix a lever 52 which is pivoted at 53 to the arm 8. The free end ofthe lever 52 is provided with an indicator 54 which moves over a scaleon the `standard and having the marks F. M. C. 0. When the indicator isopposite thev letters F, M. C or U the point madev willbe fine, medium,coarse or crayon respectively. In order to hold the lever in adjustedposition, I provide a projection 55 therein and correspondtering anddischarging them so that they can be easily collected in a properreceptacle, I provide a sheath or shell 57 open at its lower end andsecured to the carrier by screws 58 and surrounding the cutters so as torevolve with the carrier and the cutters. I preferably make this sheathor shell transparent so that the action of the cutters can be seen.

Subject matter sho-wn but not claimed herein is claimed in applicantsco-pending applications, Serial Nos. 13,161, 13.162 and 13,163, filed onMarch 9th, 1915, as divisions hereof.

It is understoodthat the present drawings and foregoing description showonly specified modifications of the invention and that other forms andmodifications are included in the spirit and scope of the invention asdefined in the appended claims.

What I claim is 1. In a pencil sharpening machine, a main frame, apencil guiding means, a milling device comprising a revolving carrier, amilling cutter revolubly mounted in said carrier, said milling cutterhaving a tapering surface whose smaller end is in proximity to the pointof the pencil when sharpened, and having a milling surface at an anglethereto and removed from the point of the pencil, said tapering surfacecontinuously approaching the axis of revolution of said carrier as saidsmaller end is approached, and means for giving said milling cutter arelative planetary movement about said pencil.

2. In a pencil sharpening machine, a main frame, a pencil. guidingmeans, a milling device comprising a revolving carrier, a plurality ofmilling cutters mounted in said carrier, said milling cutters havingtapering surfaces whose smaller ends are in proximity to the point ofthe pencil and other milling surfaces at an angle thereto and removedfrom the point ,of the pencil, said tapering surfaces continuouslyapproaching the axis of revolution of said carrier as said smaller endsare approached, and means forgiving said milling cutters a relativeplanetary movement about said pencil, comprising a gear fixed on saidframe, ccacting gears fixed to said milling cutters, and means forrevolving said carrier relatively to said frame.

3. In a pencil sharpeneing machine, a

main frame, a pencil guiding means, a millcarrier, said milling cuttershaving tapering surfaces whose smaller ends are in proximity to thepoint of the pencil, and cylindrical milling surfaces removed from thepoint of the pencil, and means for giving said milling cutters aYrelative planetary movement about said pencil, said tapering surfacescontinuously approaching the axis of revolution of said carrier as saidsmaller ends are approached, comprising a gear xed on said frame,coacting gears fixed to said milling cutters, and means for revolvingsaid carrier relatively to said frame.

al. In a pencil Sharpener, the combination of a support, a planetarycutter having a ro tating cutting member and a frame for carrying thesame, of a bearing carried by said support for the remote end of thecarrier, an adjustable pin having its axis parallel to the axis ofrotation. of said frame and passing through said bearing for controllingthe longitudinal movement of the pencil, said frame being rotatablerelatively to said 1n. p 5. In a pencil Sharpener, the combination of asupport, a planetary cutter having a rotating cutting member and a framefor carrying the same, of a bearing carried by vsaid support andengaging said pin.

6. In a pencil Sharpener, the combination of a support, a planetarycutter having a rota-ting cutting member and a frame for carrying thesame, of a bearing carried by said support for the remote end of thecarrier, an adjustable pin having its axis parallel to the axis ofrotation of said frame and passing through said bearing for controllingthe longitudinal movement of the pencil, and an adjusting member carriedby said support and engaging said pin, said member engagingl saidsupport so as to be held thereby in adjusted position.

LOUIS MYERS. l/Vitnesses:

H. B. BROWNELL, E. E. MORSE.

